Is fluoride linked to brain function changes?
Fluoride and IQ: long-term study finds no cognitive harm
A long-term study following more than 10,000 people found no negative effects of fluoridated water on brain function and IQ. Participants’ intelligence and cognitive performance were reportedly the same whether they drank fluoridated water or not while growing up.
The findings arrive as fluoride has been a flashpoint in U.S. public debate, including claims promoted by figures such as RFK Jr. and others alleging that fluoride exposure could harm the brain. The study’s results directly address those concerns by testing cognitive outcomes over time rather than focusing only on short-term or experimental measures.
What was measured
The research compared cognitive-related outcomes—specifically intelligence and measures of brain function—across people with different fluoride exposure histories in childhood.
What it means for public health policy
If fluoride has no detectable impact on IQ or cognition at the population level, that supports the continuation of fluoridation programs intended to reduce dental cavities. The story frames the study as highly anticipated because of the intensity of public controversy.
Important context
The reporting describes a lack of association with cognitive outcomes, but it does not add new information in the provided material about other endpoints such as dental effects, kidney function, or rare adverse events.
Overall, the message for readers is straightforward: the latest long-term evidence cited in the story does not support claims that drinking fluoridated water reduces IQ or harms brain function.